diff --git a/extensions/slack/src/monitor/dm-auth.test.ts b/extensions/slack/src/monitor/dm-auth.test.ts
new file mode 100644
index 00000000000..3987b974f04
--- /dev/null
+++ b/extensions/slack/src/monitor/dm-auth.test.ts
@@ -0,0 +1,64 @@
+import { describe, expect, it, vi } from "vitest";
+import type { SlackMonitorContext } from "./context.js";
+import { authorizeSlackDirectMessage } from "./dm-auth.js";
+
+function makeCtx(dmPolicy: SlackMonitorContext["dmPolicy"]): SlackMonitorContext {
+  return {
+    allowNameMatching: false,
+    dmEnabled: true,
+    dmPolicy,
+  } as SlackMonitorContext;
+}
+
+function makeParams(
+  dmPolicy: SlackMonitorContext["dmPolicy"],
+): Parameters<typeof authorizeSlackDirectMessage>[0] {
+  return {
+    ctx: makeCtx(dmPolicy),
+    accountId: "workspace",
+    senderId: "U123",
+    allowFromLower: [],
+    resolveSenderName: vi.fn(async () => ({ name: "Alice" })),
+    sendPairingReply: vi.fn(),
+    onDisabled: vi.fn(),
+    onUnauthorized: vi.fn(),
+    log: vi.fn(),
+  };
+}
+
+describe("authorizeSlackDirectMessage", () => {
+  it("allows open DM policy when effective allowFrom includes wildcard", async () => {
+    const params = makeParams("open");
+    params.allowFromLower = ["*"];
+    params.resolveSenderName = vi.fn(async () => {
+      throw new Error("users.info failed");
+    });
+
+    await expect(authorizeSlackDirectMessage(params)).resolves.toBe(true);
+
+    expect(params.onUnauthorized).not.toHaveBeenCalled();
+    expect(params.resolveSenderName).not.toHaveBeenCalled();
+  });
+
+  it("rejects open DM policy when effective allowFrom lacks wildcard", async () => {
+    const params = makeParams("open");
+
+    await expect(authorizeSlackDirectMessage(params)).resolves.toBe(false);
+
+    expect(params.onUnauthorized).toHaveBeenCalledWith({
+      allowMatchMeta: "matchKey=none matchSource=none",
+      senderName: "Alice",
+    });
+  });
+
+  it("keeps allowlist DM policy gated by allowFrom", async () => {
+    const params = makeParams("allowlist");
+
+    await expect(authorizeSlackDirectMessage(params)).resolves.toBe(false);
+
+    expect(params.onUnauthorized).toHaveBeenCalledWith({
+      allowMatchMeta: "matchKey=none matchSource=none",
+      senderName: "Alice",
+    });
+  });
+});
diff --git a/extensions/slack/src/monitor/dm-auth.ts b/extensions/slack/src/monitor/dm-auth.ts
index 7b16f9098ec..2665b149cb1 100644
--- a/extensions/slack/src/monitor/dm-auth.ts
+++ b/extensions/slack/src/monitor/dm-auth.ts
@@ -21,6 +21,10 @@ export async function authorizeSlackDirectMessage(params: {
     return false;
   }
 
+  if (params.ctx.dmPolicy === "open" && params.allowFromLower.includes("*")) {
+    return true;
+  }
+
   const sender = await params.resolveSenderName(params.senderId);
   const senderName = sender?.name ?? undefined;
   const allowMatch = resolveSlackAllowListMatch({
diff --git a/extensions/slack/src/monitor/message-handler/prepare.test.ts b/extensions/slack/src/monitor/message-handler/prepare.test.ts
index 683e2d6f07c..b0600a5ece2 100644
--- a/extensions/slack/src/monitor/message-handler/prepare.test.ts
+++ b/extensions/slack/src/monitor/message-handler/prepare.test.ts
@@ -167,6 +167,42 @@ describe("slack prepareSlackMessage inbound contract", () => {
     });
   });
 
+  it("prepares wildcard open-policy account DMs", async () => {
+    const ctx = createInboundSlackCtx({
+      cfg: {
+        channels: {
+          slack: {
+            enabled: true,
+            accounts: {
+              soltea: {
+                dmPolicy: "open",
+                dm: { enabled: true, policy: "open" },
+              },
+            },
+          },
+        },
+      } as OpenClawConfig,
+    });
+    ctx.accountId = "soltea";
+    ctx.allowFrom = ["*"];
+    ctx.dmPolicy = "open";
+    ctx.resolveUserName = async () => ({ name: "External User" }) as any;
+
+    const prepared = await prepareSlackMessage({
+      ctx,
+      account: createSlackAccount({
+        dmPolicy: "open",
+        dm: { enabled: true, policy: "open" },
+      }),
+      message: createSlackMessage({ channel: "D999", user: "U123", text: "hello" }),
+      opts: { source: "message" },
+    });
+
+    assertPrepared(prepared, "open-policy Slack DM");
+    expect(prepared.ctxPayload.RawBody).toContain("hello");
+    expect(prepared.ctxPayload.From).toBe("slack:U123");
+  });
+
   it("keeps Slack assistant DM threads in a thread-scoped session with assistant context", async () => {
     const ctx = createDefaultSlackCtx();
     ctx.saveSlackAssistantThreadContext({